i think saul's birthright would give him a dull sword. it only does 1 dmg but has tons of knockback.
T saul would be the "heart of steel" he will start with 1 steel heart. with this steel heart, saul can tank 4 hits without ever loosing 1 heart. when saul recives an hp up, he will first gain a normal red heart, then a steel heart after the next hp up. however, jhon is now a worthless little coward that wildly runs around the room, yet he holds all of saul's secrets to strength. if jhon were ever to take damage, saul will immediately loose one full heart, regardless of whether it was a steel one or not.
Jhon will run from any incoming threats, including spikes, enemies, bosses, tears, explosions, item pickup sounds, sound effects, any large increase in sound, etc. (he is truely a coward).
T saul's birthright would make jhon randomly spew out tears from any direction while running (they carry tear effects), and will spew a consistient stream of tears behind themself whilst running (dont ask why its brown)